Add collation support for uuid columns in MySQL (#19290)

The uuid type generates CHAR(36) SQL but was not included in the
$hasCollate array, causing column collation to be silently ignored.

This fix adds TYPE_UUID to the $hasCollate array in MysqlSchemaDialect
so that collation is properly applied to uuid columns.

Refs cakephp/migrations#1020

* Add collation support for uuid columns in MySQL

The uuid type generates CHAR(36) SQL but was not included in the
$hasCollate array, causing column collation to be silently ignored.

This fix:
1. Adds TYPE_UUID to the $hasCollate array in MysqlSchemaDialect
2. Adds 'uuid' to $_columnExtras in TableSchema to allow 'collate'
   attribute to be preserved when adding columns

Refs cakephp/migrations#1020

Author: dereuromark

Schema/MysqlSchemaDialect.php

@@ -834,6 +834,7 @@ public function columnDefinitionSql(array $column): string
             TableSchemaInterface::TYPE_TEXT,
             TableSchemaInterface::TYPE_CHAR,
             TableSchemaInterface::TYPE_STRING,
+            TableSchemaInterface::TYPE_UUID,
         ];
         if (in_array($column['type'], $hasCollate, true) && isset($column['collate']) && $column['collate'] !== '') {
             $out .= ' COLLATE ' . $column['collate'];

Schema/TableSchema.php

@@ -144,6 +144,9 @@ class TableSchema implements TableSchemaInterface, SqlGeneratorInterface
         'text' => [
             'collate' => null,
         ],
+        'uuid' => [
+            'collate' => null,
+        ],
         'tinyinteger' => [
             'unsigned' => null,
             'autoIncrement' => null,